<template>
    <div class="login_container">
      <div class="login_box">
        <div class="avator_box">
          <img src="../assets/logo.png" alt="">
        </div>
        <!--登陆表单区域-->
        <el-form ref="loginFormRef" :rules="loginformRules" label-width="0px" class="login_form" :model="loginForm">
          <!--用户名-->
          <el-form-item prop="username">
            <el-input v-model="loginForm.username" prefix-icon="el-icon-search"></el-input>
          </el-form-item>
          <!--密码-->
          <el-form-item prop="password">
            <el-input v-model="loginForm.password" prefix-icon="el-icon-search" type="password"></el-input>
          </el-form-item>
          <!--按钮-->
          <el-form-item class="btns">
            <el-button type="primary" @click="login">登陆</el-button>
            <el-button type="info" @click="resetLoginForm">重置</el-button>
          </el-form-item>
        </el-form>
      </div>
    </div>
</template>

<script>
export default {
  data () {
    return {
    // 这是登陆表单的数据对象
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      // 这是表单的验证规则对象
      loginformRules: {
        username: [{ required: true, message: '请输入账号', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在3-5之间', trigger: 'blur' }],
        password: [{ required: true, message: '请输入密码', trigger: 'blur' },
          { min: 3, max: 15, message: '长度在3-15之间', trigger: 'blur' }]
      }
    }
  },
  methods: {
    // 点击重置登陆表单
    resetLoginForm () {
      // console.log(this)
      this.$refs.loginFormRef.resetFields()
    },
    login () {
      this.$refs.loginFormRef.validate(async valid => {
        if (!valid) {
          return
        }
        const { data: res } = await this.$http.post('login', this.loginForm)
        if (res.meta.status !== 200) {
          return this.$message.error('登陆失败')
        } else {
          this.$message.success('登陆成功')
          // 1. 将登陆成功之后的token，保存到sessionStorage中
          // 1.1 项目中除了登陆之外的其它API接口，必须在登陆之后才能保存
          // 1.2 token 只应当在当前网站打开期间生效，所以将token保存在sessionStorage中
          // 2. 通过编程导航跳转到后台主页 路由地址是 /home
          window.sessionStorage.setItem('token', res.data.token)
          this.$router.push('/home')
        }
      })
    }
  }
}
</script>

<style lang="less" scoped>
  .login_container{
    background-color: #2b4b6b;
    height: 100%;
  }
  .login_box{
    width: 450px;
    height: 300px;
    background-color: aliceblue;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%,-50%);
    .avator_box{
      height: 130px;
      width: 130px;
      border: 1px solid #eeeeee;
      border-radius: 50%;
      padding: 10px;
      box-shadow: 0 0 10px #ddd;
      position: absolute;
      left: 50%;
      transform: translate(-50%,-50%);
      background-color: #eeeeee;
      img{
        width:100%;
        height: 100%;
        border-radius: 50%;
        background-color: #eee;
      }
    }
    .btns{
      display: flex;
      justify-content: flex-end;
    }
    .login_form{
      position: absolute;
      bottom: 0;
      width: 100%;
      padding: 0 20px;
      box-sizing: border-box;
    }
  }
</style>
